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Does the new fan have a timer option? If yes, it might be wrong to assume you can wire it with just your two wires. I recently installed a timered vent axia fan in place of a non timer fan, thinking I could wire it without a permanent live and it would operate like a non timered fan.
I was wrong, the circuitry in the vent axia timer fan required the permanent live to be there in order to work, so what was supposed to be a 30 minute job turned into an all day one digging up my floor boards to find a suitable location to wire off.
In short, it's not a simple job. You should have a switch wire which activates the fan as well as the line and neutral to provide the power. Do you have an isolation switch for the fan outside the bathroom? I'm asking to try and judge the age of the installation.
How do you want your fan to operate? Switch on with the lights, humidity detection, motion detection?